ArcGIS 9.1 installs the Python application. If deploying this as a silent install this will be installed, however it will not be removed on an uninstall. Best thing to do to make it removable is to extract the Python install from the MSI and capture it as a separate MSI. All you need to do to stop the ArcGIS setup.msi installing it is to remove the LAUNCH_PYTHON action from the InstallExecuteSequence table via a transform
ESRI supports the use of the msi parameter ADDLOCAL=ALL to perform a complete install.
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